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Finding the Fourth Proportional to 815.67, 1,126.02 and 625.05

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Solution

The fourth proportional to 815.67, 1,126.02 and 625.05 is: 862.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.67 : 1,126.02 = 625.05 : x
  2. Step 2: Convert to fraction form
    815.67/1,126.02 = 625.05/x
  3. Step 3: Cross multiply
    815.67x = 1,126.02 × 625.05
  4. Step 4: Simplify right side
    815.67x = 703,818.80
  5. Step 5: Solve for x
    x = 703,818.80/815.67
  6. Step 6: Final answer
    x = 862.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.